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Double Summation For two point correlation

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Nicole Konforti
Nicole Konforti 2017-3-3
回答： Darshan Ramakant Bhat 2017-3-6
I have to use the double summation function (attached below) where the phi function is the distance formula in three dimensional space. I have the function I need, but I am not sure how to program it into a double summation on MATLAB.
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Alexandra Harkai
Alexandra Harkai 2017-3-3
What have you tried so far? What are D and R? What arguments does your phi function take?

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回答（1 个）

Darshan Ramakant Bhat
I think the simpler way is to do using two for loops.
d_sum=0;
for i=1:length(D)
x=D(i);
for j=1:length(R)
y=R(j);
d_sum=d_sum+fi_fun(x,y);
end
end
Additionally you can try to vectorize the process. Following link may help you
https://www.mathworks.com/matlabcentral/answers/165457-how-to-calculate-double-summation-in-matlb
Regards,
Darshan Bhat

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